A) Thermocoal
B) Glass bottle
C) Tin cans
D) Paper scrap
Correct Answer: D
Solution :
Key Idea Bio-gas can be produced by the fermentation process of paper scrap, waste materials of animal, leaves, rotten woods etc. This process takes place in a digester tank. Main component of bio-gas is methane. Thermo coal, glass bottle and tin cans are synthetic products. They cannot decomposed into smaller parts by fermentation. Therefore, they cannot be used in the production of bio-gas while paper scrap can be decomposed by fermentation so it can be used for producing bio-gas.
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